Adds iDMA driver as loadable kernel module #3
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The purpose of the iDMA proxy driver is to serve as an IOCTL interface to issue a MEMCPY iDMA transfer from user-space. The proxy driver allows three different types of src/dst addressed: - IDMA_KERNEL_BUFFER: the user can mmap a kernel buffer to user-space and read/write data to it. The iDMA transfer addresses are the physical addresses of the (physically contiguous) kernel buffers - IDMA_COPY_BUFFER: Copy user-space buffers to temporarily allocated kernel-space buffers. The iDMA transfer addresses are the physical addresses of the (physically contiguous) kernel buffers - IDMA_USER_DIRECT: Use user-space mapping to get physical addresses of the buffers. User has to guarantee that the buffers are physically contiguous
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This PR adds two iDMA drivers as either in-tree or out-of-tree loadable kernel modules and three example applications to issue iDMA transfers from user-space.
The drivers have been put into their own
driversdirectory inidma-engineandidma-proxyrespectively. Both drivers can be built by invokingmake clean all deployin the respective directory. Additionally, the three applications located indrivers/idma-proxyare built as well and all binaries (drivers and apps) are copied over to the rootfs. Just make sure theARCHandCROSS_COMPILEenvironment variables are unset or set correctly, depending on your environment.